@Adrian-Faloon, Do all drivers have the same (company) phone? That is an excellent situation to gather testdata.
Curious which phone this is on. A slight amount of users experience the same problem. It is hard to find out why. As a workaround, what most of the time helps a lot is to have another GPS using app in the background. A tracker, a speed warning app or whatever.
A problem on some (mostly higher end) devices, related to the HERE platform the app is built on. HERE's own WeGo app has the same problem. Devs are nagging HERE about it, but yeah... big company, you know how it goes... 😞
I am having this too, but only under very specific circumstances. For me it is very incidental, only with one specific WP, and only when navigating online when having started the app (or the route) from within a wifi connection, after which the phone switches to the GSM network. Can you confirm the same? I would be very interested to know if the problem disappears when disabling wifi before starting the app, and if it disappears after enabling off-line mode.